html,body{
    width: 100%;
    height: 100%;
}
body{
    padding: 10px;box-sizing: border-box;
}
#login{
    width: 100%;
    height: 100%;
    background-color: #ebf2f9;
    border-radius: 3px;
    position: relative;
    box-sizing: border-box;
    box-shadow: 0 0 10px rgba(0,0,0,.8);
    overflow: hidden;
}
header{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;height: 40px;
    -webkit-app-region: drag;
}